SINCE CAUSING MAJOR outbreaks in Saudi Arabia in 2014 and in Korea a year later, the virus that causes Middle East Respiratory Syndrome is laying low. But it hasn't disappeared: A cluster of 34 cases cropped up in July in Riyadh, Saudi Arabia’s capital. The dromedary camels who harbored the virus for more than 20 years aren’t going anywhere, and neither is MERS.
Over the nearly two years since the causative virus, the MERS coronavirus (MERS-CoV) was identified, researchers have gained significant insight into the ongoing epidemic. They have also seen just how this virus compares with SARS and the answer always appears to be the same. While MERS is a bad actor, it is no SARS and most likely will not cause a pandemic.
As with SARS, fruit bats are increasingly thought to be the reservoir for MERS—specifically, the Egyptian tomb bat. The most intriguing hypothesis I’ve read is that infected bats contaminate date palms, thus exposing farm workers who have to climb the trees to pollinate them and then perform further work up in the trees to maximize yields of the fruit. Laurie Garrett likens this to the transmission of Nipah virus by bats in Bangladesh, via palm oil collected near the tree tops.
The good news, however, is that MERS historically hasn't spread far beyond hospitals and the households of those who are ill.
Although MERS doesn't appear to be exceptionally contagious, public-health experts have been tracking it closely because the disease has such a high death rate. So far, about one-third of the people with confirmed cases have died. The majority of MERS has been in Saudi Arabia, although it's spread to 18 other countries, including two recent cases in the US.
The tangled origins of a deadly new virus called MERS-CoV.
We don't know where this virus came from nor why only now are we seeing it. There is also a chance that this virus could have always been in humans but that only due to sensitive lab tests like PCR and deep sequencing we were able to detect it.
Many people now know that it was camels which caused the alarming spread of Middle East Respiratory Syndrome (MERS) seen last year, but did you know that it was also suspected that those same beasts of burden could protect us from the debilitating disease?
A newly identified betacoronavirus, human coronavirus EMC (HCoV-EMC), has been isolated from several patients with respiratory and renal disease in the Middle East. While only a few infected patients have been identified, the mortality of the infection is greater than 50%. Like its better-known cousin severe acute respiratory syndrome coronavirus (SARS-CoV), HCoV-EMC appears to have originated from bats.
MERS belongs to the Coronavirus family - a.k.a. the troublesome family of viruses responsible for SARS and the common cold. MERS, like SARS, erupted onto the world stage rather abruptly. In a little over a year...
13 February 2013: A new respiratory illness similar to the Sars virus that spread globally in 2003 and killed hundreds of people has been identified...
This study was undertaken to determine the historical and current prevalence of Middle East respiratory syndrome (MERS) coronavirus infection in dromedary camels and other livestock in the Kingdom of Saudi Arabia, where the index case and the majority of cases of MERS have been reported.
It always seemed strange, though, for camels to be the ultimate source, leaving lingering questions about whether there is another source or where camels got exposed to the virus in the first place.
Some have focused their attention on bats (which were ultimately the source of the related SARS-coronavirus).
Virus hunter Nathan Wolfe tells us about a deadly new virus.
First patient moved around hospitals for days seeking diagnosis—and infecting others
In the two years since Middle East respiratory syndrome was first diagnosed in people, scientists have struggled to figure out how we catch the deadly virus. Some blamed bats. Others pointed at camels.
Now scientists in Saudi Arabia offer the strongest evidence yet that the one-humped dromedaries can indeed spread the MERS virus — which has infected more than 800 people on four continents, including two men in the U.S.
Cases of Middle East Respiratory Syndrome (MERS) are surging again, but Saudi health officials and scientists appear unable to explain where the infections start and how they spread, the UN experts said.
Middle-Eastern Respiratory Syndrome, or MERS, has a lot in common with other emerging disease threats: we probably got it from animals.
Coronaviruses represent a threat to humans, as evidenced during the 2002/2003 coronavirus infection of Severe acute respiratory syndrome or SARS-CoV. The SARS-CoV caused more than 8,000 human infections with a mortality rate of 10% in a total of 37 countries. Ten years later, a new human coronavirus also causing respiratory syndrome, MERS-CoV (Middle East respiratory syndrome) emerged in Saudi Arabia.
For scientists who are tracking the latest outbreak, examining the environment where MERS is spreading is only a piece of a larger puzzle. They’re still racing to understand the virus itself. Researchers know that, like other respiratory viruses, MERS is highly contagious because it is spread through droplets—from when a person coughs or sneezes, for instance. But other mechanics of how the virus behaves are a mystery.
MERS is something of a medical mystery. The disease is widely found in dromedary camels, which have long carried the virus. In the Middle East camels are worked, raced and even kept as pets.
Common symptoms in patients with MERS-CoV include a respiratory illness with fever, cough, shortness of breath, and breathing difficulties. Most patients have had pneumonia. Some patients have also had kidney failure. Outbreaks in health care facilities have been frequent. Patients with underlying co-morbidities such as diabetes, heart or lung disease, or immunosuppression, appear to be at the highest risk of developing severe disease. Fortunately, it appears that the virus is not readily transmitted person-to-person.
Middle East Respiratory Syndrome (MERS) is a viral respiratory illness that is new to humans. It was first reported in Saudi Arabia in 2012 and has since spread to several other countries, including the United States. Most people infected with MERS-CoV developed severe acute respiratory illness, including fever, cough, and shortness of breath. Many of them have died.
Keeping you up to date with the latest outbreaks.
Phylogenetic analysis and high MERS-CoV viral load in nasal swabs of dromedary camels suggest local zoonotic transmission through the respiratory route.
MERS-CoV is a type of coronavirus, similar to the one that caused SARS (severe acute respiratory syndrome) or the common cold. MERS-CoV has not been previously identified in humans. Like the SARS virus, MERS-CoV is most similar to coronaviruses found in bats. It has been detected in camels, and regular handling of these animals may pose a major risk of human transmissions. It has not been detected in other livestock, but several cases of MERS-CoV in those who handle camels have been reported.
Listen to some of the latest news.
Past and ongoing pandemic threats from coronaviruses have prompted a new urgency to develop a pan-coronavirus vaccine as a global countermeasure. Both SARS and MERS are classified as Category C biodefense agents by the U.S. National Institutes of Health, with an intense capacity to inflict devastating disease outcomes and disrupt local, national and global economies.
MERS-CoV is closely related to coronaviruses found in bats, suggesting that bats might be a reservoir of MERS-CoV. Camels likely serve as hosts for MERS-CoV. The presence of case clusters strongly suggests that human-to-human transmission occurs.
The full picture on the source is not yet clear. Strains of MERS‐CoV that match human strains have been isolated from camels in Egypt, Qatar, and Saudi Arabia. These and other studies have found MERS‐CoV antibodies in camels across Africa and the Middle East.